The former head of the CIA, John Brennan, suggested that executive branch officials should refuse to obey President Trump if he fires Special Counsel Robert Mueller.

Brennan was speaking last week at the Aspen Institute's Security Forum, alongside the former Director of National Intelligence James Clapper and CNN's Wolf Blitzer.

'I think it's the obligation of some executive branch officials to refuse to carry that out,' Brennan said.

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The former head of the CIA, John Brennan, said last week that he thought executive branch officials should revolt if President Trump fired Special Counsel Robert Mueller

John Brennan said he also hoped that Republicans and Democrats would push back if President Trump tried to use his power that way

'I would just hope that this is not going to be a partisan issue,' he continued. 'That Republicans, Democrats are going to see that the future of this government is at stake and something needs to be done for the good of the future.'

Brennan brought up an executive branch revolt when Blitzer asked him how he'd like to see Congress handle the situation.

The ex-CIA chief suggested he'd want a response from them both – the executive branch and Capitol Hill.

'If he's fired by Mr. Trump or attempted to be fired by Mr. Trump, I hope, I really hope that our members of Congress, elected representatives are going to stand up and say enough is enough and stop making apologies and excuses for things that are happening that really flout, I think, our system of laws and government.'

Brennan, along with Clapper, had full confidence in Mueller, who was appointed by Deputy Attorney General Rod Rosenstein to take over the FBI's Russia probe, in the aftermath of FBI Director James Comey's firing.

Comey testified that he believed he was fired because of said probe.

'Absolutely, it was an inspired choice,' said Brennan of the Mueller pick.

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President Trump has repeatedly called the various investigations surrounding Russia's meddling in the 2016 election a 'witch hunt,' including the one helmed by Mueller.

While Trump can't fire the lawmakers looking into collusion claims in the House and in the Senate, the president does have the power to tell Rosenstein to boot Mueller.

Last week Trump told the New York Times that Mueller will have crossed a 'red line' by looking into his family's finances.

'I think that's a violation,' Trump said. 'Look, this is about Russia. So I think if he wants to go, my finances are extremely good, my company is an unbelievably successful company,' the president pivoted.